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The streets of New York are clogged with attendees of the United Nations Climate Action Summit, including Michael Bloomberg, Angela Merkel and teenage activist Greta Thunberg. Among them is Mike Cannon-Brookes, the Australian billionaire and co-CEO of Atlassian, an enterprise software firm.

Speaking with Forbes on Tuesday, Cannon-Brookes expressed frustration that Australia’s prime minister, Scott Morrison, did not attend the summit. “[U.N. Secretary-General] Guterres was right to say, ‘Don’t come with a speech, come with a plan.’ And we didn’t come with a speech or a plan.”

Cannon-Brookes voiced less measured criticism on Twitter. “What we need is real bloody leadership—instead we just get talking points,” he wrote. “Lead us. Don’t bulls—t us.” He linked to an article showing Morrison in Chicago on Monday, where he learned about new high-tech drive-thrus at McDonald’s, among other innovations.

“We have scientific and economic solutions to” climate change, Cannon-Brookes says. “But we can’t seem to get political and social alignment to allow those solutions to solve the problem.”

The criticism comes at a pivotal moment for carbon-reduction efforts, as experts say most large countries, including the United States, are failing to implement the policies necessary to avoid the most serious effects of climate change.

“We have to get this solved, from a humanity point of view. That’s a scientific fact,” say Cannon-Brookes. “The cost and difficulty of solving it ten years and 20 years from now is going to be way harder.”

This week he is unveiling a plan to reduce Atlassian’s net emissions to zero by 2050.

Cannon-Brookes, 39, cofounded Atlassian in 2002 with Scott Farquhar, as detailed in a 2017 Forbes profile. The company found a niche selling collaboration software, which helps both coders and nontechnical teams work together. Since going public on the Nasdaq in 2015, its shares have climbed more than six-fold; Cannon-Brookes and Farquhar are worth an estimated $8.7 billion each.

In 2017, Cannon-Brookes made news when he partnered with Elon Musk to help solve South Australia’s power crisis with batteries. True to character, that effort began on Twitter as well.

Despite the lack of traction in producing adequate carbon reform, Cannon-Brooks says he remains optimistic. “And why am I optimistic? Because we have no other choice.”

I've been a reporter at Forbes since 2016. Before that, I spent a year on the road—driving for Uber in Cleveland, volcano climbing in Guatemala, cattle farming in…

I've been a reporter at Forbes since 2016. Before that, I spent a year on the road—driving for Uber in Cleveland, volcano climbing in Guatemala, cattle farming in Uruguay, and lots of stuff in between. I graduated from Tufts University with a dual degree in international relations and Arabic. Feel free to reach out at nkirsch@forbes.com with any story ideas or tips, or follow me on Twitter @Noah_Kirsch.